I do 20 lessons every day.
When I level up, I do all the radical first and then vocabulary (so if I have 7 radical I do 13 vocabulary)
I try to do 10 kanji and 10 vocabulary unless I had finished all my Kanji for that level. Then I do 20 vocabulary until I level up and start the cycle again.
Lesson reorder to prioritize kanji and radicals. I try to cover all kanji and radicals in one go. Then after the first day when all radicals and kanji are at apprentice 3 I cover vocab as first lesson of the day. I do about 20-25. Once all the kanji are unlocked I focus on that and then do all the unlocked vocab on the following days.
I’m trying to get my study time to 6 am, 11 am, 6 pm 10 pm but life gets in the way 
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I’m getting ready for the fast levels, so on level up I do all radicals and all kanji.
Next day I do half the vocabs, all if I’m having a good day. If I left some I do them the next day. Leaving a few days of only reviews if possible =)
I just do everything with no limits, items that won’t stick that way are taken care of by the SRS and that works fine for me so far. So I guess my order would be old vocab, radicals, kanji and then the new vocab that gets unlocked.
All radicals as soon they are unlocked first, then using more time I go through new kanji mixing with vocabulary. When second batch of new kanji appear I try to do all in one go and go through the rest of vocabulary trying to finish them before unlocking new level.
I do the previous-level vocab lessons first, otherwise they become leeches for me. (Because once I start on new-level radicals and kanji, my focus shifts…)
For the first 10 levels I didn’t have a strategy and did massive batches of lessons at once (terrible idea if you don’t want days with 400 reviews and others with 50) 
Now I usually do 15-25 lessons per day. Depending on how many previous-level vocab lessons remain, I’ll also be able to do new-level radicals on the same or next day. Radicals are easier than the rest (especially after level 14), so sometimes I’ll go over my daily lesson limit a bit to squeeze them in.
I’ve also started trying to use [Userscript] WaniKani Lesson Filter to mix up kanji and vocab lessons on new-level items, instead of doing all the kanji then all the vocab (the default). I’m hoping this will help me remember low-apprentice kanji readings better. 
My level-up time varies between 7.5 and 9 days, mostly depending on how many errors I make and at what stage. I try really hard to limit any errors once the second batch of kanji is unlocked, to keep my level timing short. I use [Userscript] Self-Study Quiz an hour or two after new lessons because the first interval is too long for me.
I usually sort by level, then type, so do all the old vocab, then radicals and so on. I look at my apprentice count, and expected review workload for the next couple days to see how many levels I’ll do. Not very consistent in the amount per day as a result. This level I actually prioritised radicals, then randomized vocab and kanji and got lessons to zero in a couple days after that. Then second wave of kanji and vocab I do whenever they become available, again keeping an eye on apprentice count and expected reviews.
I should say this is my second time through the early levels, I was at 51 before resetting. So my accuracy is pretty good apart from typos. Also a lot more experienced with the language, compared to two and a half years ago, when I started learning.
I finish the previous levels lessons as they become available. That usually means a 2-4 day break before the new level actually starts. I am trying to keep my level up speed to no more than 2 per month in order to avoid burnout again. If my apprentice count is above 150, I stop lessons until it goes down. That’s a sign that the information is not sinking in or I have missed a lot of burns.
I don’t sort at all and just go the traditional WK route. Sometimes pausing if my reviews are too high
I just don’t want more than 200 review per day (usually ~150) so I can do other things. Plus I want room to get G1 -> G2 items wrong and not load apprentices plus any surges of master/enlightened that happen through a week. Not all vocab is equal with either easy breezy intuitive onyomi and then evil special readings or verbs. Lately, 5-15 lessons on a normal day and if my apprentice count is low I will do 20-45. I don’t lesson reorder and never really considered it, I just know it was the kiss of death for users who abused it. Plus I want to see the vocab from newly guru’d kanji, it just seems optimal as is.
That’s what I do. Just let SRS take care of the ordering. That’s what it’s there for!
i actually just wrote a guide on that. Check it out, if you’re still interested in this topic: How to build an efficient WaniKani schedule (level up as comfortable as possible): the guide
This is my strategy. I set my review batch size at three and I use Reorder to choose which kinds of review I do.
When I level up I always do the radical lessons if they’re there, and I might pad the final batch of radicals out with some kanji. Radicals are almost free reviews anyway. At most twelve lessons per session (in one hour) with a few sessions a day, getting smaller over the course of the day.
Once the radicals are out of the way, I do batches of just vocab with maybe a single batch of kanji to keep things interesting - so nine vocab lessons and three kanji lessons, or twelve vocab lessons and three kanji lessons. I do this until the vocab is all gone, because once I start levelling kanji I don’t want to have to deal with any vocab lying around.
Once all the vocab lessons are out of the queue, I get to just focus on doing kanji lessons for a few days. Those are good days.
Usually by the time the last of the kanji are out of my lesson queue - three or six kanji per session, with a couple of sessions every day - the guru reviews are starting to come in and I’m starting to amass vocab lessons again.
I don’t get any rest days doing levels this way but it is efficient without being overwhelming. It just requires consistency.
Generally speaking I don’t do lessons for any more than fifteen items at a time. If it’s just kanji, the most I like to do is six. Three is more normal. I do a few lesson sessions a day but if I start dropping too many Apprentice 2 reviews, I go slower. If it’s all coming easy, sometimes I push my luck and go quicker.
On the later levels, fifteen lesson items in a session is plenty. Twelve is more normal. I can still level quickly enough but there’s no gap day while I’m waiting for the Guru reviews. There’s always lessons coming in every day as long as I keep getting things right. It’s like a marathon pace - it requires consistency but you’re never really sprinting.
For Level 60 I will ignore all that and just scoff the entire lesson queue in a single day like I used to. That’s how I want to celebrate getting to level 60 and I don’t care how much of it I get wrong. I have lots of pet leeches already.
So you are reviewing on a schedule as well? Like everycouple hours or something? Otherwise all your lessons line up again, right?
Kind of! I usually review first thing in the morning, at lunchtime, after work, last thing at night, and whenever I notice a big bundle of reviews hitting. I mostly nibble at it throughout the day to keep review sessions small - small sessions make it easier to review where I went wrong, look up kanji/vocab that confused me, that kind of thing.
I plow through the vocab in order to get to those sweet sweet radicals. Your rate of advancement is limited by the radicals. Yesterday I painfully (苦しく？) blew through like 50 vocab words since I gurud a bunch of kanji at once at the end of a level. I take my time with the new Kanji and vocab for the new level.
Thank you for your reply, but I’m kind of confused. At the beginning of your post are you talking about the actual reviews (you learned that item already) or about the new lessons or about both? The way I understood it now is that you’re doing all your radicals and vocab in small increments on day one and after that just a bit of kanji everyday. Does that mean that you’re doing every level on max speed? Please clear the confusion, also if my understanding was correct, doesn’t that mean that you’re sometimes reviewing an item hours after it got in your review queue? Isn’t that lowering your accuracy?
Sorry, have edited the post to make it clearer when I’m talking about lessons versus reviews.
So many interesting ways of attacking leveling. I just realized I have no real strategy at all. I just do everything that’s thrown at me as soon as it’s made available.
But, I do count how many kanjis are left before my level up, and I might stop my reviewing when getting toward one left to make sure I do my new vocab lessions before going further.
If I then still feel up to it, I might continue reviewing until reaching the next level. At that point, I at least do all radicals and probably all kanji. Probably also the new vocab since it uses the old kanji.
Then I sleep! Zzzzz 
I do the lessons as they appear but I feel less motivated by the vocabulary lessons.
I’m a slow gower. I try to do 5 lessons a day.
I prioritize reviews over lessons.